JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Xiaomi Meng,Lin Yang,Wenju Jiang,Lu Yao
In this study, a N-functionalized porous carbon derived from ZIF-8 (NFPC) was prepared and applied for the gaseous acetone and toluene adsorption removal. The NFPC perfectly inherited the morphology of parent ZIF-8, posed a high specific surface area (S BET = 1228 m 2 ·g −1 ), be rich in surface nitrogen functional groups, and resulting in a good dynamic adsorption of the VOCs. The NFPC-1000 exhibited the best adsorption performance of low concentration acetone and toluene, with equilibrium adsorption capacity of 203.4 and 297.1 mg·g −1 at 25 °C respectively. The acetone and toluene adsorption were spontaneously and exothermic, given the negative values of free energy (ΔG) and enthalpy (ΔH). The difference of acetone and toluene adsorption on NFPC attributed to the affinity difference (boiling point, polarity and molecular diameter), the nitrogen-containing functional groups (pyridinic-N) and the cation-π bonding. Therefore, the NFPC was found to be more favorable for aromatic compounds adsorption, the toluene adsorption of NFPC-1000 only decreased 5.3% after 6 cycles reuse, while its adsorption capacity of acetone lost more than 60%.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yihan Wang,Siqi Wu,Qinjian Yin,Kai Du,Qiang Yin,Bo Jiang,Site Mo
Mussel-inspired polydopamine (PDA) can serve as building blocks and interfaces in designing functional materials. Here, the use of PDA as an interlayer between polyaniline (PANi) and multidimensional carbon materials, such as graphene quantum dots (GQD), multiwalled carbon nanotubes (MWCNT), and graphene nanosheets (GNS), to improve the thermoelectric performance of p-type polymer-based materials has been reported. The introduction of PDA promotes the carrier mobility of GQD/PDA/PANi, CNT/PDA/PANi, and GNS/PDA/PANi ternary composites due to the superior adhesive property of PDA. An optimal conductivity of 4.98 × 104 S m–1 and a power factor of 92.17 μW m–1 K–2 at 363 K are achieved in GNS/PDA/PANi, which are much higher than the values of GNS/PDA and GNS/PANi. More surprisingly, despite the fact that GQD/PDA, CNT/PDA, and GNS/PDA binary composites show p-type properties, the pyrolysis treatment of GQD/PDA, CNT/PDA, and GNS/PDA at 800 °C results in a gain in both the electrical conductivity and negative Seebeck coefficient of c-GQD/PDA, c-CNT/PDA, and c-GNS/PDA. The c-CNT/PDA composites possess the highest Seebeck value of −30.2 μV K–1 and a maximum power factor value of 35.57 μW m–1 K–2. Finally, a flexible thermoelectric generator with 24 thermoelectric units composed of GNS/PDA/PANi and c-CNT/PDA is demonstrated, which gives an output voltage of 52.8 mV at a temperature difference of 60 °C.
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Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zhi-Wen Zhang,Cui-Ying Lu,Guang-Hui Liu,Yuan-Jia Cao,Zhen Wang,Ting-ting Yang,Yu-Hong Kang,Xian-Yong Wei,Hong-Cun Bai
A green and effective nitrogen and nickel in-situ doping strategy was designed to prepare cellulose-based N/Ni co-doped porous carbon (PC). The co-hydrothermal pretreatment induced by hydrazine hydrate and nickel acetate effectively modifies the physico-chemical structure of PC and further improves its electrochemical performance. The efficient N-supply and unique heteroatom regulation performance of hydrazine hydrate is related to its strong reducibility. The specific surface area and total pore volume of the synthesized N 4 NiPC 220-3 are 1383.66 m 2 g −1 and 0.59 cm 3 g −1 , while the N and O contents are 1.35 and 10.41%, respectively. At current densities of 0.5 and 20 A g −1 , N 4 NiPC 220-3 exhibits a high specific capacitance of 415 F g −1 and a good capacitance retention of 72.22%, respectively. After 10,000 charge/discharge cycles, the retention rate is as high as 96.06%, confirming its excellent cycling stability. The two-electrode system test results further show that the energy density of N 4 NiPC 220-3 is as high as 35.6 W h kg −1 at a power density of 500.1 W kg −1 , while a high retention rate of 87.87% is still obtained after 10,000 cycles. This green and efficient synthesis method based on in-situ co-doping of hydrazine hydrate and nickel acetate is a promising alternative strategy for producing carbon-based supercapacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Shuang Ji,Zhourong Xiao,Haocui Zhang,Ling Li,Guozhu Li,Li Wang,Guozhu Liu
A high surface area (HSA) Ce 0.75 Zr 0.25 O 2 (CZ) support was synthesized by hydrothermal synthesis method with assistance of surfactant (cetyltrimethyl ammonium bromide , CTAB), and then 2.0 wt% Ru was impregnated on it to obtain a steam reforming catalyst for n-dodecane. The surface area of Ru/HSA-CZ catalyst is 107.6 m 2 g −1 , which is ca. three times higher than that prepared through the sol-gel (sg) method (34.3 m 2 g −1 , Ru/CZ-sg) and ca. 40% higher than that without CTAB (76.7 m 2 g −1 , Ru/CZ-wo). Catalytic steam reforming of n-dodecane, shows the completely conversion of n-dodecane over Ru/HSA-CZ and slightly drops about 6% (650 °C, LHSV = 12 mL/g h, S/C = 4, time on stream = 7 h) while 81% and 70% were observed for the Ru/CZ-wo and Ru/CZ-sg but with twice (or triple) deactivation rates. The possible reason for observed better performance of Ru/HSA-CZ should be attributed to the high metal dispersion of Ru over HSA-CZ, and the favorable Ru-support interaction as evidenced by H 2 -Temperature programmed reduction (H 2 -TPR), and high redox ability of high surface area Ce 0.75 Zr 0.25 O 2 support thanks to high Ce 3+ content. Further steam reforming of n-dodecane over Ru/HSA-CZ at higher LHSV (750 °C, LHSV = 36 mL/g h, S/C = 4) exhibits completed conversion and without significant deactivation.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 20
·9403-9414
·
IF 4.682
Fan Lei,Xu Zhilong,Sun Peizheng,An Lanfang,Han Jie,Guo Rong
Bacterial infection is a growing threat to public health worldwide. Ferrous ions have been proved to have good antibacterial properties. However, ferrous ions are easy to be oxidized, which limited its further application. Therefore, the design of nanosystems that can stably release ferrous ions is highly desirable. Here, N-doped hollow carbon nanospheres anchored with Fe 7 S 8 nanosheets (N-HCNs@Fe 7 S 8 ) were synthesized by a hydrothermal method. The particle size, crystal form, and specific surface area of the synthesized composites were characterized. N-HCNs@Fe 7 S 8 can release Fe 2+ ions, which could kill Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) without using light or H 2 O 2 . Fe 2+ concentration increases with the prolonged soak time of N-HCNs@Fe 7 S 8 , and the antibacterial ability is closely related to Fe 2+ concentration. The Fe 2+ released by N-HCNs@Fe 7 S 8 has a promoting effect on the healing of skin wounds infected with S. aureus . The proinflammatory cytokines (TNF-α and IL-6) were effectively reduced in N-HCNs@Fe 7 S 8 -treated wounds, and N-HCNs@Fe 7 S 8 could effectively inhibit inflammation. Therefore, the Fe 2+ release effect of N-HCNs@Fe 7 S 8 and its good biocompatibility make it a candidate material for antibacterial therapy and promoting wound healing. Graphical abstract
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Polymer Chemistry
·
2013
·Vol. 5
·期 8
·2951-2960
·
IF 5.231
Minghui He,Guangxue Chen,Xun Huang,Ruixin Xu,Zhaohua Zeng,Jianwen Yang
N-Phthaloyltranexamic acid ammonium salt derivatives integrating with peroxides can invoke redox photopolymerization and propagating polymerization. A series of N-phthaloyltranexamic acid ammonium salt derivatives based on benzophenone, thioxanthen, and naphtha chromophores as novel photocaged bases were synthesized and characterized. In combination with a benzoyl peroxide initiator, these structures were able to initiate the amine-mediated redox photopolymerization of acrylates. In particular, the covalent binding of N-phthalimidoamino acid and type II chromophores (thioxanthone, benzophenone) improved remarkably the photoreactivity of photocaged bases (thioxanthen-DBU and benzophenone-DBU) compared to the parent compound. Furthermore, naphthal-DBU matches well the emission spectra of the mercury lamp with a dominant emission wavelength at 365 nm. More importantly, phthal-DBU & BPO as a new photocaged redox combination can invoke controlled redox polymerization within an irradiation time of 3 min. Finally, due to the persistent interaction of the produced longeval amine with peroxides, remarkable post conversion after irradiation, which is significant for preparation of photo-screened materials, was thus initially achieved in the redox photopolymerization.
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 8
·2129-2137
·
IF 9.405
Di Liu,Ping Yang,Hao Zhang,Minjie Liu,Wenfei Zhang,Dongmei Xu,Jun Gao
A non-noble heterogeneous catalyst – a Co, N and C composite encapsulated carbon nanotube grown in situ on the surface of activated carbon (Co–N–C/CNT@AC) – was fabricated via the pyrolysis–reduction process. Co–N–C/CNT@AC catalyzed the reductive coupling of structurally diverse nitroarenes and alcohols to imines and secondary amines under exogenous base- and solvent-free conditions. BET, TEM, SEM, XRD and XPS characterization showed that the exceptional catalytic property of Co–N–C/CNT@AC could be explained by its nanostructure, Co–N and basic N species. Our protocol had advantages of low cost, environment-friendliness, and good applicability. Furthermore, a reaction route of nitroarenes, amines and alcohols as the starting materials was proposed to improve the atom economy of the reductive coupling of nitroarenes with alcohols.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Hongyu Dong,Ke Li,Yiwen Wang,Yanhong Yin,Shuting Yang
Lithium-oxygen (Li–O 2 ) batteries are an ideal energy storage device, but the problems of the cathode still hinder their development. In this work, a metal-free, binder-free and in situ pyridine N-doped cathode of Li–O 2 batteries is synthesized in one step by electrospinning. Meanwhile, the effect of carbonization temperature on cathode is discussed in detail. The content of pyridine N in the cathode is the highest at the carbonization temperature of 700 °C, and it is also the most effective for the reversible formation and decomposition of Li 2 O 2 . In terms of Li–O 2 batteries performance, when the charge and discharge current density is 100 mA g −1 and the discharge voltage is greater than 2 V, the discharge specific capacity and discharge capacity can reach 27900 mAh g −1 and 27.9 mAh respectively. In addition, when the limited specific capacity is 1000 mAh g −1 , the batteries can work stably for 85 cycles under the same conditions. Therefore, the high-performance cathode which synthesized in one step by electrospinning is expected to promote the commercial application of Li–O 2 batteries.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Beibei Liu,Xiaohua Ren,Long Chen,Xiaoxin Ma,Qiong Chen,Qidi Sun,Lin Zhang,Pengchao Si,Lijie Ci
High efficient adsorption of radioiodine in nuclear waste has attracted extensive attentions all over the world. In this work, we fabricated sulfur and nitrogen co-doped graphene aerogels (SN-GA) through one-step hydrothermal method, and investigated its iodine adsorption behavior including adsorption kinetics and isotherms in water. Our results reveal that SN-GA exhibits a 3D porous architecture with thiophene-S, oxidized-S, pyridine-N, pyrrole-N and graphite-N co-doped into the sp 2 carbon frameworks. The adsorption experiment showed SN-GA has a maximum iodine adsorption capacity of 999 mg g −1 determined by Langmuir isotherm, and the adsorption process could be better described by the pseudo-second-order model.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Yong Chen,Panwei Yu,Guoyuan Ren,Qiang Zhang,Qiuxia Han,Hongni Teng
Antibacterial modification of polymers with potent biocides via an efficient and universal approach is very desirable in both academia and industry. A polysiloxane with both quaternary ammonium and N-chloramine was prepared via a facile three-step synthetic route. Poly(methylhydrosiloxane) (PMHS) was first reacted with 2-(dimethylamino)ethyl acrylate to introduce an ending tertiary amine that was subsequently quaternized with 3-(3-chloropropyl)-5,5-dimethylhydantoin (CPDMH). The 5,5-dimethylhydantoin moiety was then transformed into its N-chloramine counterparts by chlorination with tert-butyl hypochlorite to produce quaternary ammonium (quat)/N-chloramine polysiloxane. The CO2-philic quat/N-chloramine polysiloxane was interpenetrated into polyethylene terephthalate (PET) in supercritical carbon dioxide (scCO2) and formed a 70 nm biocidal layer. The synthetic procedures and interpenetration results were characterized with Fourier transform infrared spectroscopy (FTIR), 1H NMR, scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The incorporation of quaternary ammonium and N-chloramine exhibited improved synergetic biocidal performance against Staphylococcus aureus and Escherichia coli, providing a complete kill of a 7-log reduction of both species within a contact time of 10 min. The polysiloxane interpenetration layer was stable and the rechargeability of lost chlorine was good when the layer was subjected to repeated washing, storage, and UV irradiation. This modification procedure uses ecologically responsible CO2 as solvent and is expected to be applicable to substrates of other chemistry since it does not rely on chemical linkage.
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CHINESE CHEMICAL LETTERS
·
2014
·
IF 1.178
Dong-Shun Deng,Guo-Qiang Han,Xiao Zhu,Xuan Xu,Yu-Tong Gong,Yong Wang
Mesoporous N-doped carbon supported palladium catalyst Pd@CN 0.132 was able to efficiently catalyze unprotected indole to indoline under mild conditions. In the aqueous system, a selectivity of 100% and conversion of 96% was achieved under 313 K and atmospheric hydrogen gas.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Lei You,Shunlong Ju,Jianwen Liu,Guanglin Xia,Zaiping Guo,Xuebin Yu
Li metal is the most ideal anode material for next-generation high energy lithium-ion batteries. The uncontrollable growth of Li dendrites, however, hinders its practical application. Herein, we propose the adoption of Zn nanoparticles uniformly embedded in N-doped carbon polyhedra homogeneously built on carbon cloth (Zn@NC@CC) to prevent the formation of Li dendrites. Based on theoretical calculation and experimental observation, lithiophilic Zn nanoparticles and N-doping inside of the as-synthesized Zn@NC play a synergistic role in enhancing the adsorption capacity with Li, thus resulting in uniform Li deposition and complete suppression of Li dendrites. Moreover, the porous N-doped carbon polyhedras uniformly distributed on carbon cloth effectively relieves the volume change of Li upon repeated Li stripping/plating process, which contributes to preserving the structural integrity of the whole electrode and hence enhancing its long-term cycling stability. Benefiting from these synergistic effects, the Li-Zn@NC@CC electrode delivers a prolonged lifespan of over 1200 h at 1 mA cm −2 with an areal capacity of 1 mA h cm −2 in symmetric cells and high Coulombic efficiencies of 95.4% under an ultrahigh capacity of 12 mA h cm −2 . Remarkably, Li-Zn@NC@CC//LiFePO 4 full cells deliver a high reversible capacity of 110.2 mA h g −1 at 1C over 200 cycles.
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